Найдите значения выражения (5/12+3/8)12/19 6/7(11/18-5/12)

1-ый пример.

(5/12 + 3/8) * 12/19 = 1/2;

1-ое деяние.

5/12 + 3/8 = 5 * 8/12 * 8 + 3 * 12/8 * 12 = 40/96 + 36/96 = 40+36/96 = 76/96 = 19 * 4/24 * 4 = 19/24;

2-ое деянье.

19/24 * 12/19 = 19 * 12/24 * 19 = 228/456 = 1 * 228/2 * 228 = 1/2.

2-ой пример.

6/7 * (11/18 - 5/12) = 1/6;

1-ое действие.

11/18 - 5/12 = 11 * 12/18 * 12 - 5 * 18/12 * 18 = 132/216 - 90/216 = 132-90/210 = 42/216 = 7 * 6/36 * 6 = 7/36;

2-ое деянье.

6/7 * 7/36 = 6 * 7/7 * 36 = 42/252 = 1 * 42/6 * 42 = 1/6.